JP3240488B2 - Emergency information relay transmission system - Google Patents

Abstract

PURPOSE:To repeat and transmit additional information in succession to emergency information so that a prompt countermeasure can be taken by maintaining a set emergency information repeating path for a definite period of time even after the end of the emergency information. CONSTITUTION:When the emergency information and the additional information are transmitted from a low order base station side while a radio wave is being received, an emergency tone signal is detected and converted into a direct current by an emergency tone signal filter 4 and a detector 5. Then, a timer circuit 6 is driven, and a relay contact 2 is turned,to an OFF state by a relay 7, and a system is returned 16 repeating operation. At that time, the circuit 6 is set previously at a larger value than the total time of an emergecy tone signal and an additional information signal. Accordingly, the operating time of the relay 7 is prolonged, and repeating operation time is maintained for a definite period of time, and the emergency information and the additional information are transmitted and relayed surely to a control office side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a train radio system in which a radio base station is connected by a real line or a carrier line, and emergency information from a lower mobile station is communicated by a higher mobile station. In particular, the present invention relates to an emergency information relay transmission system for relaying emergency information via a lower base station preferentially.

[0002]

2. Description of the Related Art Generally, in order to perform communication between a mobile station mounted on a train and a control station that controls the mobile station, base stations are arranged at predetermined intervals along a railway line and any one of the base stations is arranged. And the mobile station are connected by a wireless line. The signal received by the base station is transmitted to the control station via a relay transmission line for communication. In that case, when a higher-level base station closer to the control station as viewed from a certain mobile station is communicating with another mobile station, the relay transmission line is connected to the higher-level base station and the lower-level base station is connected. Is disconnected from the relay transmission line, so that the call cannot be made until the call on the upper side ends.

However, when an emergency occurs in a lower mobile station, it is necessary to contact the control station as soon as possible and to deal with it, so that an emergency signal indicating that fact is transmitted. However, when the upper side is communicating, since the relay transmission path is cut off as it is, the emergency signal cannot be transmitted to the control station, so when each base station receives the emergency signal from the lower side, the base station Priority is given to relaying emergency signals even during a call.
By doing so, the emergency signal transmitted from any mobile station can be reliably transmitted to the control station regardless of whether the upper side is busy.

[0004]

However, in such a conventional system, it is known that the control station has been notified of the emergency, but it is not known where or what emergency occurred. For this reason, all mobile stations are inquired about which mobile station transmitted the emergency signal after terminating communication during a call, and from which mobile station the emergency I do not know if the situation was notified, and the response was delayed.

For this purpose, an additional signal indicating what kind of emergency has occurred from which mobile station may be transmitted after the signal indicating the emergency. However, only emergency information can be relay-transmitted with priority, and when transmitting an additional signal, the emergency information is over, so the relay transmission path is disconnected when the upper mobile station is talking. Therefore, relay transmission cannot be performed preferentially up to the additional information. In order to carry out relay transmission to additional information preferentially, it is only necessary to attach a function capable of preferentially transmitting additional information signals in addition to emergency information to all the base stations, but this would reduce economic efficiency.

[0006] The present invention has been made in view of such a situation, and when emergency information is transmitted, additional information can be preferentially relay-transmitted without significantly lowering economic efficiency.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a mobile station which, when an emergency occurs, provides an emergency information.
After transmitting the notification, the mobile station is identified within a predetermined period t2.
And additional information indicating the contents of the emergency
To each base station, before sending from the lower side.
Outputs a detection signal while receiving and detecting emergency information
Detecting means and an emergency information detection period in which the detection signal is output
The interval t1 is extended only by the extension period t3 longer than the predetermined period t2.
Timer means for extending the emergency information detection period t1
And the extension period t3, priority is given to information from the lower side.
Transmission line switching means for relay transmission to the upper side .

[0008]

When the emergency information is transmitted from the mobile station, the base station having received the emergency information transmits it to the upper side. The higher-level base station that has received the signal detects the signal, and relays the emergency signal received even during the call by the base station to the higher-level side. At this time, the relay transmission path is maintained for a certain time. As a result, the lower signal can be relayed and transmitted for a certain period of time even after the emergency information ends. Therefore, even if additional information is sent following the emergency information, the additional information can be relayed and transmitted, so that the control station can know where and what kind of abnormal situation has occurred, and take quick action. It becomes possible.

[0009]

An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram of a base station radio apparatus, and FIG.
Shows an operation time chart when the emergency information signal is relayed. 1
Is a wireless receiver of the base station, 2 is a relay contact described later, 3
Is an amplifier, 4 is an emergency tone signal receiving filter, 5 is a detector, 6 is a timer, and 7 is a relay. 8 is an emergency tone signal waveform example, and 9 is an additional information transmission signal.

The output of the radio receiver 1 is sent to the upper base station via the relay contact 2 and the amplifier 3. The state of the relay contact 2 indicates a state where radio waves from the mobile station are being received, and the relay contact 2 is in a state opposite to that shown in FIG. Has become. Therefore, all the base stations that are not in communication with the mobile station relay the signals supplied from the lower side.

FIG. 2 shows a state in which emergency information 8 and additional information 9 are sent from the lower base station side during the radio wave reception state.
When such a signal is transmitted, the emergency tone signal filter 4 and the detector 5 shown in FIG. 1 detect the emergency tone signal and convert it to DC. Then, the timer circuit 6 is driven, and the relay 7 is turned off by the relay 7 to return to the relay operation.

At this time, the timer circuit 6 functions to extend the emergency tone signal detection time t1. The additional information transmission signal from the lower base station is after the emergency tone signal,
The time t2 can be set to a constant value for system operation. Therefore, the time t3 extended by the timer circuit 6 is set to a value larger than t2. By the operation of the timer circuit 6, the operation time of the relay 7 is changed from t1 to t1.
The emergency information 8 and the additional information 9 are reliably transmitted and relayed to the control station side because the relay operation time is extended to + t3.

It is most economical and reliable to use a frequency shift signal using a modem as the additional information transmission signal.

[0014]

As described above, according to the present invention, after the emergency information is received, the signal transmitted thereafter can be relayed for a certain period of time. Without providing a receiver, it is possible to configure a wireless base station that reliably relays and transmits, and it can be applied to existing mobile communication systems as it is by adding some functions. Have.

[Brief description of the drawings]

FIG. 1 is a block diagram of a radio base station according to the present invention.

FIG. 2 is an operation diagram showing an example of an emergency information relay operation of the present invention.

[Explanation of symbols]

 Reference Signs List 1 radio receiver 2 switch 3 amplifier 4 emergency tone signal filter 5 detector 6 timer circuit 7 relay 8 emergency tone signal waveform example 9 additional information signal

Continued on the front page (72) Inventor Tetsuo Tsuji 393 Haritacho, Kodaira-shi, Tokyo Inside Hitachi Electronics Techno-System Corporation (72) Inventor Masahiko Wada 1-1-1 Itohashi, Aoba-ku, Aoba-ku, Sendai City, Miyagi Prefecture East Japan Railway Company Tohoku Construction Office Co., Ltd. (72) Ryoichi Chiba 1-1-1, Itohashi, Aoba-ku, Sendai, Miyagi Prefecture Tohoku Construction Office East Japan Railway Company (72) Inventor Atsushi Yamada Go, Aoba-ku, Sendai City, Miyagi Prefecture 1-1-1 Hashi, East Japan Railway Company Tohoku Construction Office (56) References JP-A-4-90629 (JP, A) JP-A-63-179630 (JP, A) (58) Int.Cl. ⁷ , DB name) B61L 1/00-29/32 G08B 23/00-31/00 H04B ^7/ 14-7/26 H04Q ⁷ /00-7/38

Claims (1)

(57) [Claims] When a mobile station is wirelessly connected to any one of a plurality of base stations disposed along a railway line, a signal received by the base station is transmitted to a control station via a relay transmission line. a system for call and control station side and the mobile station by being connected is made, each base station, emergency from the lower side
When the information is sent, the base station is busy.
Also gives priority to the emergency information from the lower side and relays it to the upper side.
By configured to send, when the emergency information is sent from the mobile station emergency other base station the emergency information even if performing communication with another mobile station is relayed transmitted to the control station In the information relay transmission method, when an emergency occurs, the mobile station transmits the emergency information
After the transmission of the mobile station, the mobile station is identified within a predetermined period t2.
And additional information indicating the contents of the emergency
Means for transmitting the emergency information transmitted from the lower side.
Detecting means for outputting a detection signal during reception detection;
The emergency information detection period t1 in which the detection signal is output is
A timer for extending the extension period t3 longer than the predetermined period t2.
Immer means, the emergency information detection period t1 and the extension period
During the interval t3, the information from the lower side is prioritized and the information is
Transmission line switching means for repeating transmission, and
An emergency information relay transmission system, which relays the issued emergency information and additional information to a control station .